package com.leyou.item.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.leyou.common.entity.Category;
import com.leyou.item.dto.CategoryDTO;
import com.leyou.item.entity.CategoryBrand;
import com.leyou.item.mapper.CategoryMapper;
import com.leyou.item.service.CategoryBrandService;
import com.leyou.item.service.CategoryService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;

import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {
    @Autowired
    private CategoryBrandService categoryBrandService;
    @Override
    public List<CategoryDTO> queryCategoryByParentId(Long pid) {
        List<Category> list = this.query().eq("parent_id", pid).list();
        return CategoryDTO.convertEntityList(list);
    }

    @Override
    public List<CategoryDTO> queryCategoryByBrandId(Long bid) {
        //1.根据品牌id,查询中间表
        List<CategoryBrand> categoryBrandList = categoryBrandService.query().eq("brand_id", bid).list();
        if (CollectionUtils.isEmpty(categoryBrandList)){
            return Collections.emptyList();
        }
        //获取分类id集合
        List<Long> categoryIdList = categoryBrandList.stream().map(CategoryBrand::getCategoryId).collect(Collectors.toList());
        List<Category> list = this.listByIds(categoryIdList);
        return CategoryDTO.convertEntityList(list);
    }
}
